Hydraulic pump



Oct.v11, 1932. F. MOODY 1,882,025

HYDRAULIC PUMP Original Filed Aug. 21, 1920 TTOREYS Original application Patented Oct. 11, 1932 j Usirsn STATES 'i issaorsl Lewis FERRY MOODY, on PHILADELPHIA, PniyiasvriviinraA HYDRAULIG ruine.

This invention relates tohydraulic pumps and particularly to those of the double or twin type.` Y

The object of my invention is to provide a pump of this character in which the flow therethrough shall proceed along smooth lines and without'losses due to eddies, disturbances or sudden changes in direction of flow.A A further object is to provide a pump of this character which is simple in construction and formed of but few parts.

Numerous other objects and advantages will appear from the following description taken in connection with the accompanying drawing which represents in vertical section,

partly in'elevation, a pump embodying my invention and wherein 10 represents a central volute outlet casing, 11 and12 similar intake casings which ar-ebolted to the outlet casing at 16, and 13 and 14 represent similar rotary impellers mountedupon a central driving shaft 15.v The intake casings 11 and 12 are each formed with an. intake passage 17, 18 leading'to the helicallyinclined guide vanes 19 and'20. The intake passages maybe of the single or double volute form and serve to direct the water from a general radial direction into an axial direction at 23, 23.

From 'these` pointsthe passages 17, 18 turn Yeo outwardly forming annular vane free chambers`21 22 which communicate with the'impellers 13 and 14. vThe passages through the impellers continue to Ycurve outwardly` without abrupt change in direction and coinmunicate attheir dischargeends with passages 26, 27. These passages are formed be-V tween the outer wall ofthe casing 10 and the wall of a central'core 28 supported fromv the wall 30 by helically incline 29, 29. y 4 f Y The impellers 13 and 14 are keyed or other; wise secured on the shaft 15 and are held d guide'vanes against lateral displacement by means vof an enlargement 32 on the shaft 15 and a. nuti33 also on the shaft. The nutand *enlargement serve to force the impellers against a central spacing sleeve 34. The enlargement 32fand nut 33 have each a tapering outer surface which forms an unbroken continuation of the filed Aug1is1r21, 1920, Serial No. 405,185, and in Canada v.April 3, 1923.V vDivided and this application filed June 15, 19'23. Serial No. 645,53*?.V

inner 'wall of the passage through the impeller-4V y f f* Similarly the wall of core 28 forms anout.- Wardly inclined smooth continuationof the `inner wall of the impellers.

Shaft 15 is supported by inwardly extend ing bearings 36, 37 formed inthe walls of the intake casings 11, 12. -The ,Valles 1 9 andl 20 connect the bearings at theirinnerA ends with the wall of the intake passageand so assist in supporting the bearings and in form# ing a rigid construction.

In practice the water entering throughthe passages 17 and 18 is givenjthe desired degree of whirl by the entrance vanes 19 and 2O and thence passingthrough the vane free cham bers 21 and 22 is delivered to the: impgellersl 13`and 14 in the form, of solid whirling streams. Issuing from the impellers the flows pass `outwardly through the diagonally inclined outlet passages 26 and 27 between the helically inclined guide varies 29, 29 into In proceeding fzontal plane containing the axis, to facilitate removal of the shaft and-impellers.

.The pump of this invention is particularly adapted for arrangement in the horizontal passage through leach :of the shaft position. The out-flow will'be gradually deceleratedalong smooth'spiral lines and Y without losses due to eddies arid'disturbancfes and sudden changes'of d irectioi'i of theflow.

.In this invention, the vvelocity reduction is accomplished. by wrapping a lsingle large diffusion passage around the circumference `of the discharge space, from the impellers.

The dischargefrom the impellers has a whirl around the aXisand annular diffusion spaces 26 and 27 are provided-in which. the water can' whirl freely. [These ,chambers Adiverge from the axis and gradually curve toward but ber containing, l y reasons, Ystay'vanes designed to conform to not completely to the radial direction thus Vcausing the flows to enter volute 10, in directions which diagonally cross each other, without flow disturbance or eddy currents being created'at the point'of inergence. The diagonal feature of thepassages is plainly ob-l served from the drawing fromwhich it is to be vnoted' that if the passages'or chambers 26, 27

had their 'centerlines extended they would vdiagonally cross each other.

of the respective passages will also diagonally cross eachother, 'if extended into. the volute casing. The. avoidance of .How disturbance l5 is because both flows have a whirling action in the same direction sot-hat vthey merge with each otherfalong tangential lines ratlierthan along straight 'y non-whirling V lines which would tendto give a head-cn action between the flows with consequent excessive eddying at the junction" o f'mergence. lt is by the utilizationof the above principle thatpit Vpossible tomaterially'reduce diameter o f the volute l()y rather than have 'adarge difV Y ameter volute lsuch as is ordinarily used when passages corresponding' to '26 and 27" turn completely to a radial direction before discharging into thervolute. Thus lain Vable-to buildnot only a more economical construc- 'f "3 l tion-'lout also one that requires less'space for a given capacity; Asthe water recede's from i the axis, the whirl is decreased bythe principle of the conservation Yof moment of momentum in accordance'with which r Guia constant', rbeing the radius ando.,A the velocity of whirl. l Y Y Y Y Y To` continue the diiu'singaction, the volute casing 10 provides' along Vspiral chamber v V"'wrapl'ued around the circumference of theY 19 Ydischarge passagesffromth'e impellers.4r f

these -passages,.the whirling component ofV the" discharge velocity from the inipellersj reduced to a low .value along smooth lines efliciently converting the velocity headv of J lwhirl into effective pressure head in the dis- The diffusion actionpfor the flowfr'om each runnergisy vproduceditirst by an Charge enlarging, diverging Vannular' chamber free of vanes,then a continuation ofthis cham- Vify necessary for mechanical theV flow andto interfere as little'as possibleV `with it, and finally a long/spiral diffusion 'espace receiving the"` discharge from the two annular chambers and wound around the cirpumps of the spiral typefto which this Vvinvention'applies the Yrecoveryof theenergy lhf'thefwater discharged from the impellers is an'extrem'elyimportant'p'art of hydraulic 'ln more'speciiic as ect of'this feature the correspondmsides.

action of the pump, since this energy. repre sents a value in high speed pumps ofthis type which is large compared to thenet headv against which the pump is delivering.v

This application is a division of 'my co-f pending application Ser. No. 405,185,led August 2l, 1920. Y u l K. I claim:

combination two `oppositelyV disposed Vun- 4shroudediinpellers of approximately axial .1. .A' rotary; hydraulic pump/'having n flow type and la single volute dischargel .casing receiving the discharge frombotliI ot,

said impellers, said iinpellers; operating within chambers bounded by surfaces of revolution generated by lines of gradual curvature smoothly merging 'vinto the surface of said volute discharge casingsaid chambers'being so disposed that their center lines diagonally cross each other vwhen extended, thechambers comprising. vanefree, annular spaces adapted to receive water directly from said? iinpellers while the remainder of each of said 1 chambers-have therein a V'pluralityof guide 1 y vanes.

shrouded'high speed type, a, converging conduit for each impeller adapted'for accelerap tion ofthe' water on itsfway to the impeller,

a divergingv conduit adapted to receivewater from each. impeller with a high velocity lwhirl in Jthe-same direction asl the rotation of the impellerland todecelerate said water i i on its way from-theimpellersaidv conduitsy being so disposed relative .to each other .that

they surfacesthereof if extended would di- 2. A rotary Vhydraulic 'pump .having in t Vcombination two opposed impellers yof'unagonally cross each other, and a common yvolute .casing receivingpthe discharge from both of said diyergingconduits. Y

3..V In a rotary hydraulic pump two oppor?.

sitelyv disposed unshrouded impellers of the n' typey having a largecomponent vof axial flow in combination with a converging inflow con- 'I duit for each Vof said impellers comprisingV means for imparting-whirlabout `the impell'er iio axis to theV water' enteringgthe impellers,

means `forming passages in :which said Vimpellers operate, said passages. being sodis.- posed relative to each other. that their surfaces Y Y 'iis would diagonally cross .each other if exf Y tended,fand. a common volutedischarge con-y `duit receiving. the vflow from 'both impellersV f Vin a diagonaldirection. t, l

4. A diffuser'for a'hydraulic pump comprising a volute' passage adapted to'decelerate the flow and having aplurality of diagonal V- 1 annular entrance spaces so disposed: relative vtoV each other that ifVA extended their centerA Y' lines would "diagonally cross each other, said, spaces having vane-free annular passages .anda 'plurality ofhelically curved guide vanes.

A '.'ffln a double .pumpY theycombinationA` a centralvolute'passage supportingacentral."

around said impellers and having annular passages thereto .from saidlmpellers, said passages comprising vane free annular spaces adapted to receive water directly from said Y impellers, the remainder of each of said passages having therein a plurality of helically curved guideV vanes. Y I

7. In a twin hydraulic pump, a central outlet casing and a pair of inlet casings secured to said outlet casing at opposite sides thereof,

said inlet and outlet casings being formed with continuous inlet and outlet passages,fa pair of impellers in said passages, a shaft upon which said impellers are mounted, the wall of each of said inlet casings being formed with an inwardly projecting bearing for said shaft'and Aand carrying said impellers,

Vguide, vanes in said tracting intake passages communicating with y said impellers.

l1.V Adouble having a central casf ing formed of an outer wall, core and vanes interposed between said wall and core, said wall and core forming between thema volute discharge passage and outwardly inclined annular passages communicating therewith, impellers at the entranceV to said annular passages, a shaft extending through said core tapering means upon said shaft and rotating therewith for preventing lateral displacement of said impellers and intake casings surrounding said lmeans and forming therewith vane free contracting intake said impellers,said passages being preceded by volute contractingpassages, j

l2. Iii-combination with a casing having suction and discharge means, a double im. peller Connected at each side with said suction, and means in the suctionat each side of said impeller and separated `therefrom by for imparting rotational and axial, velocity to the fluid beforer conversion chambers entering the impeller.

Lnwis FERRY Moon-Y. y

inlet casings connecting said bearings with` the `walls of said casings.

8. In a double pump a central casing comprising an outer wall, a core, vanes interposed between said walls, and Vsupporting said core, said walls and core forming between them a` volute discharge passageand outwardly inclined annular passages which if extended would diagonally cross each other whereby'they discharge diagonally into said into said volute, and vimpellers inpsaid out-l wardly inclined passages.

9. In a double pump a central casing comi prising an outer wall, a core supported by vanes interposed betweensaid walls and core, v

said walls andcore forming between them a volute discharge passage and a pair of outwardly inclined annular passages so disposedV relative to each other that if corresponding sides of each passage are extended they will diagonally cross each other whereby fluid discharges diagonally into said volute.

l0. A double pump having aoentral casing.

formed of an outer wall, core and vanes in terposedA between said wall and core, said wall and core forming between them a volute discharge passage and outwardly inclined annular passages communicating therewith,

impellers at the entrance to said annular passages, a'shaft extending through said core and carrying said impellers, tapering means upon said shaft and rotating therewith for preventing lateral displacement of said im pellers and intake casing surrounding said means and forming therewith vane free conpassages communicating with 

